Apparatus for measuring the area of hides.



W. H. SCHULZE.

APPARATUS FOR MEASURING THE AREA 0F HIDETS. APPLICATION FILED NOV. 13, 19m.

Lwaawo v Patented 001;. 26, 1915.

W MA 6% WILHlEIlM HEINRICH SCHUJLZE, 0E FBANKFORT-0N-THE-1VIAI N,' GERMANY.

Specification of Letters Patent.

APPATUS FOR MEASURING THE AREA OF HIDES.

Patented Uct. 26, 1915.

Application filed November 13, 1914. Serial No. 872,014.

To all whom it may concern:

Be it known that I, WILHELM HEINRICH SoHULzE, a subject of the German Emperor, and resident of Fran-kfort-on-the-Main, Germany, have invented certain new and useful Improvements in Apparatus-for the present invention.

The construction of the improved machine is based on the fact that an air-current is sucked. through a perforated plate 3 or a wire gauze by means of a fan 8. According to whether the plate? and thus'part of the perforations of the same are covered more or less by the hide/l to befmeasured, of course a corresponding reductionof the air-current cross-sectionhappens. Thereby,

- a rarefaction of the air and thus a measurable sub-pressure of the same is created,

which serves for the calculation of of the hide put on the plate,

Preferably, the perforated plate 3 is airthe area tightly fixed on afunnel-shaped frame 5,

which terminates in a cylindrical extension 9, which forms the supply pipe for the fan, and further in a square foot 'plate. fl-At the bend between the funnel and the cylindrical extension, thepipe6 for the vacuum gage 2 is attached. Bcsides,th'e axle of the fan is in communication with the tachometer 1 by means of a flexible shaft 7, Both instruments are arranged above the measuring plate 3, so that their-oscillations can be easily read 0d. 5 4

Of course, the exactness of the calculation depends largely upon the suitability and careful manufacture of the plate 3,

which must be of uniform thickness throughout and not too thin if drilled holes or perforations are employed, which latter must be of small bore and uniformly arranged thercin as near as possible to each other. Thereby,. small alterations of the boundary lines of the different hides can be calculated by the corresponding coi'ering or uncovering of the holesin the plate.

If, instead of the drilled and thus rather thick plate 3, perforated sheet-metal or strong wire-gauze with fine interstices is used, a careful mounting and stretching on the frame 5 is necessary, in order to meet the air pressure if the greatest portion of the interstices is covered. v

The walls of the funnel 5 must not be too much tapered, in order to permit of the single air-currents flowing uniformly through the funnel and thus to prevent-the calculations from being made incorrect.

The result of the calculations can either be read off directly from the vacuum gage '2, or, if the latter has ordinary atmosphere division only, can be found by comparison with the tachometer from an empiric table provided for this purpose.

What ll. claim, is Apparatus for measuring the area of hides, comprising in combination, a funnelshaped frame having a lower cylindrical extension, a finely perforated top plate fixed on said frame, a fan in communication with said cylindrical extension adapted to suck air through said perforated top plate, a tachometer in communication with the .axle of said fan, and a vacuum gage in communication with the lower end of said funnel,

substantially as and for the purpose set forth. v

WILHELM HEINRICH SCHULZE. Witnesses:

CARL BUoHMfiLLEn, JEAN GRUNDr 

